Projection apparatus



Jm 1947- A. A. GRADISAR ETAL I ,3

rnoncnon Arrm'ms .Filed June 25, 1942 4 snooty-Shut 1 ALB/N A. GRAD/SA}?BY GUSTAVE. GUEL A any drawings.

Fig. 4 looking in the Patented Jan. 28, 1947 2,414,867 PROJECTIONAPPARATUS Albin A. Gradisar and Gustav E. Guellich, Buflalo,

mesne assignments, to 1 Company, Southbridge,

N. Y., assignors, by

American Optical Mass, a voluntary ass oclation Application June 25,1942, Serial No. 448,512

' 1 Claim. (CI. 88-24) invention relates to projection apparatus and hasparticular reference to improvements in apparatus for projecting thecontour or outline of objects on to a screen where they can be measuredor compared with standards or the like.

in object of the invention is to provide improvement in apparatus forprojecting the contour of an object on to a screen for measurement orcomparison.

Another object of the invention is to provide a device of the type setforth with new and improved means for removably holding the imageforming system in definite predetermined relation to the optical axis ofthe illuminating beam as well as to the reflector and screen.

Another object of the invention is to provide a device of the type setforth with new and improved means tor'adjusting the screen.

Another object is to set forth with means to seal .the same against oilvapors, dust, etc. to prevent the reflecting surface and surfaces of theoptical members from becoming fogged or dirty.

Other objects and advantages of the invention will be apparent from thefollowing description taken in connection with the accompanying it willbe understood that many ches may be made in the details of constructionand arrangement of parts without departing from the spirit of theinvention as expressed in the accompanying claim. We therefore do notwish to be limited to the exact details of construction described by wayof illustration only.

Referring to the drawings:

Fig. i is a side view embodying our invention.

Fig. 2 is a top or plan view thereof.

Fig. 3 is a front view thereof.

Fig. 4 is a'sectionai view taken on line H of Fig. zlooking in thedirection of the arrows.

Fig. 5 is a fragmentary sectional view takenon line i-W of Fig. 3looking in the direction of the arrows. p

Fig. 6 is a sectional view taken on line 8-4 of direction of the arrows.

Fig. 7 is a sectional view taken on line 1-1 of Fig. l loo in thedirection of the arrows; and

Fig. 8 is a sectional view taken on line 8-8 of Fig. 2.

Referring more particularly to the drawings: The instrument comprises abase or support 5 on which is secured halts or the like 3.. it ispointed out that the provide a device)! the type of a Projectionapparatus a housing 2 by means 0! the housing 2 contacts the base I inonly three points 4 at which points the housing 2 is secured to saidbase I by said bolts or the like 3. Thus the base image forming system 1and arrangement of parts shown and as the preferred form has been shown*member 23 which is I1 which engages one end I and housing 2 areseparate unitsand the base I and housing 2 may be easily separated foruse of the housing on other type bases.

The projection apparatus comprises essentially a source of illumination5, a work holder Ii, the image forming system 1, reflector 8 and screen9. The lamp 5 is positioned in a lamp housing It) which lamp housing I0is detachably connected at its lower end to the forward end of the baseI and said lamp house III has louvers II adjacent the upper end thereofand is provided with the motor I2 and suction fan I3 adapted to causeair to enter satil lamp house III through said louvers II and which airis exhausted from the lamp house through the louver II. Thisconstruction provides a constant flow of air through the lamp house andforces the heated air out of the lamp house through the lowerventilating and cooling said lamp house.

If desired a reflector may be positioned behind the lamp I to increasethe illumination. 0n the lamp house In is the projecting portion I5containing the condenser lens system I8 and prism or other reflector I1adapted to reflect light from the lamp I across the work holder 6through the whereupon the image of the work on the work holder 8 isprojected onto the reflector 8 from which it is. reflected onto thetranslucent screen 9. Y

The work holder shown is adapted-for supporting threaded objects such asthe tap I8 andsaid work holder comprisesthe center supports I9 and 20supporting the centers 2| and 22. The center support 2| is spring loadedandv the center. 22 is adapted to be actuated by the micrometer screwprovided with the micrometer drum 24.

The spring loaded tail, center comprises the sleeve 35 which is clampedin the support I9 by means of the handle III and in said sleeve 35 ispositioned the tail center 2| 'slidably mounted but restricted againstturning by pin 38 which is,

pressed or threaded into sleeve 85, passes through slot 38 in tailcenter 2| and backs up floating plug of the coil spring 39 which springis positioned the tail center 2| and supplies relatively uniformpressure on the tail-center 2 I.

The handle 4| acts as a stopior tail center 2| in the position shown inFig. 8 and provides means for operating the said tail center to allowin-- sertion or removal of the work.

portion thereof thus in the hollow bore of the driving member having Themeasuring center consists of sleeve 22 which is clamped in support 26and in said sleeve 22 is positioned the center 42 which is slidablymounted in said sleeve 22 but restricted against rotation by means ofthe pilot screw 44 operating in slot 43. This slot 43 and screw 44 alsolimit the travel of the center 42.

Adjacent the opposite end of the sleeve 22 is positioned the micrometerscrew 24 which has the extension 45 engaging the end of said center 42and adapted to accurately measure the travel of said center 42. i

The rotation of the centers 2i and 42 is prevented because the objectsfrequently held by these centers are threaded and it is important thatsuch objects do not rotate while the pitch of the thread is beingmeasured.

The image forming system 7 is adapted to be positioned on the arms 25and 2S and held thereon by the spring member 21. To align the axis ofsaid image forming'system 1 the arms 25 and 26 are provided with thescrew members 21 and 28.

The flange 49 on the end of the objective tube 1, and adjacent thewindow 29 locates the whole objective axially on the optical axis so asto produce a predetermined magnification on the screen when the work inthe object holder is in sharp focus on the screen; This flange 43 mayberigidly located in an opening or slot or in engagement with aresilient member onthe frame 2, adjacent the window 29, or on thesupport 26.

The housing 2 is provided with an opening in which is positioned awindow 29 aligned with said image forming system I. lows the entrance ofthe projected image into the housing 2 while preventing the entrance ofoil, vapor, dust, etc. therein.

To rotate the ground glass screen 9 a friction drive is provided. Thisfriction drive comprises a plurality of spaced rollers 30 adjacent theperiphery of the support 3| for said ground glass screen 9 with saidrollers adapted to ride in a slot or groove 32 in the periphery of saidsupport 3|. Adjacent one of said rollers 30 is provided the knob 33 andthe tapered surface 34 adapted to frictionally engage This window 29althe roller member 30 which in turn frictionally engages the screensupport 3i so that rotation of said knob 33 will cause simultaneousrotation of the support 3| and ground glass screen 9.

It is pointed out that with the construction described above that therotation of the knob 33 and screen 9 will always be in the samedirection, that is, a clockwise rotation of the knob 33 will produce aclockwise rotation but to a reduced degree of the screen 9 and viceversa.

To seal the hood against oil vapors, dust, etc. we provide a resilientwasher member 46 which is secured in a slot in ring 3| and resilientlyand slidably engages the surface of the flange 41 on the partition 48 ofthe casing 2.

From the foregoing it will be seen that we have provided simple,efficient and economical means for obtaining all of the objects andadvantages oi the invention.

Having described our invention we claim:

In a contour projector, in combination with an optical projecting systemincluding an objective tune, a cabinet, a reflector within the cabinet,said cabinet being completely enclosed except for a projection openingand a screen opening formed in wall portions thereof, said objectivetube bein removably supported by said cabinet so as to normally closesaid projection opening, a circular screen overlying said screen openingand rotatably supported on said cabinet, said openings and reflectorbeing arranged to permit an image received by said reflector from saidoptical projecting system by way of said projection opening to bereflected by said reflector to said screen overlying said screenopening, and means for prev venting vapors, dust or the like fromentering said openings and reaching the reflector positioned within thecabinet, said means including an annular flange on said rotatable screenand a resilient ring between and cooperating with said cabinet andflange and completely sealing the annular space therebetween, and atransparent window aligned with said removable objective tube andpermanently sealing said projection p ning.

. 'ALBIN A. GRADISAR.

GUSTAV E. GUELLICH.

